Rollup of 6 pull requests

[matthiaskrgr]

Successful merges:

• rustdoc: make mergeable crate info more usable #148234 (rustdoc: make mergeable crate info more usable)
• Add suggest alternatives for Out-of-range \x escapes #149201 (Add suggest alternatives for Out-of-range \x escapes)
• [rustdoc] Make more functions return fmt::Result and reduce number of .unwrap() calls #149208 ([rustdoc] Make more functions return fmt::Result and reduce number of .unwrap() calls)
• miri: use tikv-jemalloc-sys from sysroot #149252 (miri: use tikv-jemalloc-sys from sysroot)
• Use let...else consistently in user-facing diagnostics #149255 (Use let...else consistently in user-facing diagnostics)
• Fix missing double-quote in std::env::consts::OS values #149275 (Fix missing double-quote in std::env::consts::OS values)

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